Flexural strength, fatigue life, and stress‐induced phase transformation study of Y‐TZP dental ceramic

Abstract

The zirconia based ceramic has mechanical properties that may allow it to withstand the loading found in posterior areas. Transformation toughening was found when high loads impacted on the surface of zirconia. However it should be born in mind that this work was not carried out on veneered specimens, which exhibit different failure modes.

Influence of surface treatment of yttria-stabilized tetragonal zirconia polycrystal with hot isostatic pressing on cyclic fatigue strength

“…It was reported that the cyclic fatigue strength of Y-TZP at 5×10 5 cycles was 60-65% of the biaxial flexural strength in the static test 1,14,21) . However, from the clinical point of view, in this study, the cyclic fatigue strength of HIP Y-TZP treated by sandblasting and acid-etching was much higher than 320 MPa, the required fatigue strength of Y-TZP in surgical implants as specified in ISO 13356 20,22,31) .…”

“…Zirconia, and yttria-stabilized zirconia (Y-TZP) in particular, are often used for the framework of fixed prostheses and dental implants when a metal-free restoration is required due to their mechanical, biocompatible and esthetic performance [1][2][3] , and may overcome the drawback of titanium (Ti) implants that have gray coloring and risk of its hypersensitivity 4,5) . Zirconia implants have shown direct bone apposition and high stability in vivo 6) .…”

Y-TZP zirconia regeneration firing: Microstructural and crystallographic changes after grinding

“…The literature shows a wide range of monoclinic content identified in sintered specimens that reveals differences related to the manufacturer's processing regimen, the zirconia composition, grain size and polishing procedures 34) . In general, studies showing 0% monoclinic content after sintering are usually associated with a post-sintering polishing, a procedure that was not performed in this study 20) .…”

Biological and Structural Characterization of Y-TZP for Implant Abutments

“…The peaks used in this study corresponded to the main bands related to the zirconia component [14]. Strong peaks were found at 260, 320, 464 and 642 cm -1 .…”

“…A highly localized stress on the zirconia surface results in a phase transformation from tetragonal into monoclinic or cubic forms [14,15]. The cracks dissipation is limited by this crystalline forms change, decreasing the risk of ions release from the bulk of the material.…”